METHOD OF REFINING MOLTEN IRON Russian patent published in 2025 - IPC C21C1/00 C21C5/28 C22B9/05 C21C7/68 

FIELD: performing operations.

SUBSTANCE: invention relates to a method of refining molten iron-containing material. In the method, raw molten iron-containing raw material with carbon concentration [C]_i of 0.5-3.0 wt.%, including both said values, is placed into a vessel and oxygen is blown into raw molten iron-containing raw material at atmospheric pressure with simultaneous blowing of gaseous hydrogen, gaseous hydrocarbon or gaseous mixture of these gases with a flow rate of 0.1 to 0.3 nm³/min per ton of molten iron-containing material for decarbonisation and denitrogenation of raw molten iron-containing material, wherein molten iron-containing raw material is subjected to decarbonisation and denitrogenation until concentration of [N]_f nitrogen in the treated molten iron-containing raw material is equal to 30 ppm wt. or less.

EFFECT: possibility of stably producing low-nitrogen steel under condition of using increased amount of solid iron-containing raw material without considerable reduction of productivity and increase of costs and without increase in amount of formed slag and amount of formed CO₂.

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